Ileal duplication cyst: repeated spontaneous decompression delays diagnosis

A duplication cyst of the ileum was initially observed in a fetus at 26 weeks gestation on prenatal ultrasonography. Repeated spontaneous resolution of the cyst by decompression into the adjacent bowel lumen delayed diagnosis and management until the child was 9 months of age. The child experienced two episodes of hemorrhage from the cyst as a result of the delay in diagnosis.